OMG stop acting like you know everything unless you have tried all of these cards and even then you got some duff cards to make the 670 close to a 680 or 7970 when both are OC'd. This is simply untrue.
I have also read lots of reviews that suggest the 7950 can keep up with the 670 when both are OC'd due to the 7950 having lots of headroom. Much of what you read is probably stock vs OC or vice versa and hense the fanboy shinnanigans.
I didnt say that your crazy because you dont agree with my analogy, I said your crazy not to want a 680 for 39 quid more, because the 7970 is on par with 680 performance wise is most situations.
The 680 is newer, therefore if both were same price 680 would be best buy, but they are not so its price-performance ratio
Please post some links to back up your analysis otherwise what you say is just words.
Im actually a little surprised that on a forum that most people consider themselves precision builders or enthusiasts that there is so much speculation and so little inhouse testing.....
in terms of 670's ability to overclock and comparative performance when OC'd please see my thread here;
http://forums.overclockers.co.uk/showthread.php?t=18403803
my opinions on 670 performance levels are based on data collected from actual end users, not potentially biased reviews
I've owned both ATI/AMD graphics cards and Nvidia so your claim that I am a fanboy just because I happen to have chosen a 670 this time around is simply laughable... if you read what I've written above you will see that I've said that the 7970 is a decent card IF you can get it at a good price and that the LIGHTNING 7970 doesn't represent good value as it doesn't tend to OC any better than a standard 7970 (again, based on actual end user data)
so you are telling me that I'm crazy for not wanting an imaginary card at a price that doesn't exist? because I can't find any retailer selling a "7970=GTX680" for "£39" more than the price that I paid for my custom cooler GTX 670
by screaming fanboy at everyone who doesn't agree with you, you are only making yourself look like one and devaluing your own statements in the process
as another example, take a look at this 680 OC'd 1293mhz (which is a very good OC for a 680) vs. 670 windforce at 1358 (which is a good/average OC for a windforce) = heaven scores within 5 points of each other = 0.1 of an FPS difference
http://hardforum.com/showthread.php?t=1694021
this echos my own testing (for yes I have tested both a 680 and a 670 personally)... my 3D monitor doesn't support 7970 which is why i erred toward nvidia this round, but if the cost/performance had been in AMD's favour I would have considered it as I intend on switching to dual GPU on a non-3d 1600p monitor soon anyway but then my own previous crossfire issues combined with continuing reports of crossfire issues in the games that I play most also put me off
7970 is a decent card,
7970 lightning isn't worth the premium over normal 7970 IMO
so how about you? I don't see any links from you supporting your opinion either... which you are entitled to without me shouting fanboy at you for no real reason
for another comparison of OC'd 670 vs 680 (with 7970 as well);
http://www.hardocp.com/article/2012/05/14/geforce_680_670_vs_radeon_7970_7950_gaming_perf/3
as you can see here it is game dependent but there are cases where 7970 pulls ahead but also where 670/680 pull ahead and where they are all 3 level within a 1FPS of minimum frame rate... it's basically a 3 way tie... so again I'll say yes the 7970 is a decent card, but my 670 at £300, for £80 less than the 7970 you posted does represent good value
for me personally, there are enough dips in min and avg. framerates that would cause caution in recommending a 7950 over a 670, unless the person asking was limited by funds and just wanted the best card they could afford (but then in that case I would probably recommend a 7850 heavily OC'd as they seem to come out quite well for the price they are)